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Welcome to the Bunnings Workshop community @Aimran. It's wonderful to have you join us, and many thanks for your question about restoring limestone.
Could you please post some photos so our members can better understand the issue you're trying to fix? Once they see the damage, they'll be better informed when assisting.
Have the pavers been sealed with some coating? If so, that sealer would need to be stripped off before you could even attempt to restore the limestone underneath. Stipping the sealer to access the limestone would be a tedious and labour-intensive process. Even if you can remove all the sealer, restoring the limestone would be difficult, or it could be permanently damaged. I'd suggest you contact the person who did the work and request that they resolve the situation.
I'll be looking forward to seeing some photos and assisting further.
Mitchell
Thanks for those images. This mottled effect could be moisture trapped in the pavers that now can't escape due to the sealer. How long after the tiles were cleaned before the sealer was applied? Before the sealer was applied, was a moisture check done on the pavers? This would have involved a piece of black plastic being taped down on a paver for two hours to see if moisture was drawn out. If these tiles are adhered to a concrete slab, do you know if a membrane was applied over the slab before installing the pavers? Did they use Crommelin 1L DiamondCoat Clean N Prep after the acid clean?
If this moisture is only present due to the pavers being damp when the sealer was applied, then you need to open up the pores and let them dry out. This would involve scrubbing down the area with Crommelin 1L DiamondCoat Clean N Prep and then waiting for this discolouration to resolve itself. You can then re-coat the site again to seal it. However, if this moisture is travelling up from a concrete slab, then the issue would be harder to resolve.
It's essential to ensure the pavers are fully dry before coating, and the required check must be done to ensure moisture is not trapped. You would need to wait several days after rain or cleaning for the pavers to dry out and pass the moisture test.
Mitchell
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